Automotive 60 X 4 LCD Segment Driver for Multiplex Rates Up to 1-4

PCA85134H

The PCA85134 is a peripheral device which interfaces to almost any Liquid Crystal Display (LCD) with low multiplex rates. It generates the drive signals for any static or multiplexed LCD containing up to four backplanes and up to 60 segments. It can be easily cascaded for larger LCD applications. The PCA85134 is compatible with most microcontrollers and communicates via the two-line bidirectional I²C-bus. Communication overheads are minimized by a display RAM with auto-incremented addressing, by hardware subaddressing, and by display memory switching (static and duplex drive modes).

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Block Diagram

PCA85134 BLOCK DIAGRAM

PCA85134 BLOCK DIAGRAM
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Features

  • AEC-Q100 compliant for automotive applications
  • Single-chip LCD controller and driver
  • Selectable backplane drive configurations: static, 2, 3, or 4 backplane multiplexing
  • 60 segment outputs allowing to drive:
    • 30 7-segment alphanumeric characters
    • 15 14-segment alphanumeric characters
    • Any graphics of up to 240 elements
  • Cascading supported for larger applications
  • 60 x 4-bit display data storage RAM
  • Extended operating temperature range from -40 °C to +95 °C
  • Wide LCD supply range: from 2.5 V for low threshold LCDs up to 8.0 V for high threshold twisted nematic LCDs
  • Internal LCD bias generation with voltage follower buffers
  • Selectable display bias configurations: static, 1/2, or 1/3
  • Wide logic power supply range: from 1.8 V to 5.5 V
  • LCD and logic supplies may be separated
  • Low power consumption
  • 400 kHz I²C-bus interface
  • No external components required
  • Display memory bank switching in static and duplex drive mode
  • Versatile blinking modes
  • Silicon gate CMOS process

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